What is the function of a counter balance valve?
Counterbalance valves play an integral role in the important task of safely controlling an actuator which may be holding a load or a person in the air. They help manage pressure created by impacts and loads to help stabilize loads, avoid equipment damage, and cope with hose failure and more.
What kind of valve is a counterbalance valve?
Parker counterbalance valves are screw-in type cartridge valves that control the pressure at an actuator controlling its motion. Uses include controlling over-running loads in cylinders and motors.
How does counterbalance work?
A counterbalance is a weight or force that balances or offsets another as when two objects of equal weight, power, or influence are acting in opposition to each other. The objects are then said to be in counterbalance.
How does a hydraulic counter balance valve work?
This valve can also be used with hydraulic motors and is then commonly called a brake valve. With no pressure in the line leading to the cylinder’s cap-end port, the counterbalance valve prevents the load from dropping. The check valve lets fluid flow into rod-end port to raise the load.
How do you select a counterbalance valve?
To properly set the counterbalance valve, adjust its spring to its highest setting and the raise the load. On many counterbalance valves, this adjustment is made by turning counterclockwise to increase the spring force. Next, very slowly turn the adjustment in the opposite direction.
Where should a counterbalance valve normally be located?
A counterbalance, or load-holding, valve is a mechanism typically located near the actuator that uses hydraulic pressure to keep a load from moving. Generally, these valves have three related functions: support, control and safety.
What is pilot ratio counterbalance valve?
Therefore, the vast majority of counterbalance applications are satisfied with a 3:1 pilot ratio. Higher ratios will be more efficient (reduce heat generation) but at the cost of stability and smooth motion control. This is why 10:1 pilot ratio valves, generally, should be avoided.
What is a vented counterbalance valve?
Vented counterbalance valves with pilot assist are meant to control an overrunning load. Other names for this valve include motion control valve and over center valve. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.
What is a counter balance valve?
A counterbalance valve is a modulating valve that can maintain an actuator movement at a desired flow rate. The load will not “run away” due to the effects of external forces, such as gravity.
How does a hydraulic pressure relief valve work?
In a hydraulic circuit, a hydraulic pressure regulator opens and bypasses fluid when pressure exceeds its setting. The valve then closes again when pressure falls. The valve acts as a pressure relief valve and can bypass fluid anytime without intervention.
What is the function of a hydraulic check valve?
Hydraulic check valves are used to protect the heat exchanger and avoid overpressure when the heat exchanger is blocked.
How do hydraulic pilot valves work?
Hydraulic pilot valves have a predetermined pressure setting that dictates when the pilot valve opens and closes. As pressure builds up around the pilot valve, the pressure sensor determines when the valve should open. The pilot valve will then release hydraulic fluid into the other valves until the pressure setting is below the maximum pressure.